Thermodynamic of universe with a varying dark energy component

Abstract

We consider a FRW universe filled by a dark energy candidate together with other possible sources which may include the baryonic and non-baryonic matters. Thereinafter, we consider a situation in which the cosmos sectors do not interact with each other. By applying the unified first law of thermodynamics on the apparent horizon of the FRW universe, we show that the dark energy candidate may modify the apparent horizon entropy and thus the Bekenstein limit. Moreover, we generalize our study to the models in which the cosmos sectors have a mutual interaction. Our final result indicates that the mutual interaction between the cosmos sectors may add an additional term to the apparent horizon entropy leading to modify the Bekenstein limit. Relationships with previous works have been addressed throughout the paper. Finally, we investigate the validity of the second law of thermodynamics and its generalized form in the interacting and non-interacting cosmoses.

Accepted for Publishing in IJMPD

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• Thermodynamic descriptions of Polytropic gas and its viscous type as the dark energy candidates
• Thermodynamic analysis of gravitational field equations in Lyra manifold
• Energy definition and dark energy: a thermodynamic analysis
• Thermodynamical study of FRW universe in Quasi-Topological Theory
• A note on cosmological features of modified Newtonian potentials